nbc's duncan gulstani has more from england. >> reporter: tomorrow amanda knox will find out if she must once again sit in an italian courtroom, or whether her long-running case is closed for good. it's more than a year and a half since the 25-year-old was able to return home a free woman. >> i'm really overwhelmed right now. >> reporter: after four years in prison, she and boyfriend raffaele sollecito had their convictions overturned. but now italy's highest court is set to decide if their acquittal should be rejected. prosecutors in the italian town of perugia wants a whole new trial. >> the prosecutors obviously are upset with the acquittal, and they're going to the supreme court to have it reviewed to say that the appellate court got it wrong, and that the guilty charge in the trial court was correct and that should stand. >> reporter: knox was convicted of sexually assaulting and murdering meredith kercher at the hillside villa the two women shared. prosecutors claimed knox and sollecito killed the exchange student in an attack fueled by drugs, sex and jealous. the police and forens